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Using CentOS. I cannot connect remotely and I believe it is related to fact I can only connect locally if DISPLAY is set to :0.0. Something is misconfigured but I can't figure out what.

>xhost +

    access control disabled, clients can connect from any host

>emacs -d :0.0


>emacs -d 

    Cannot connect to X server

>emacs -d localhost:0.0

    emacs: Cannot connect to X server localhost:0.0.
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up vote 0 down vote accepted

This is because Xserver is refusing TCP connections

run gdmsetup as root and uncheck "Deny TCP connections to Xserver"

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